## helpmexoxo 3 years ago A firecracker shoots up from a hill 150 feet high with an initial speed of 95 feet per second. Using the formula H(t) = −16t2 + vt + s, determine how long it will take the firecracker to hit the ground.

1. NotTim

1. Let's draw a diagram. 2. LEt's make a variables list 3 Find der formulas tu need!

2. NotTim

4. Solve it! remember which formulas need to be 'combined'!

3. Romero

Do you just want the answer?

4. NotTim

blue bird! go back to your other question! THIS MA TOWN!

5. NotTim

oooh wait. this aint physics...

6. helpmexoxo

How would i make a variables list?

7. NotTim

you just need to find the end points!

8. helpmexoxo

I'm confused :o

9. helpmexoxo

I thought you only plug in the numbers to the equation but i'm unsure if that's correct or how to do it even if it is correct

10. NotTim

v=95 ft/s H(t)=150

11. NotTim

solve for s!

12. NotTim

wait...what's s? solve for t, silly me

13. helpmexoxo

ok but there is also a s!?

14. helpmexoxo

I tried to solve but i'm soooo confused

15. lgbasallote

let H(t) = 0 then solve for t

16. NotTim

really? shoot. I suck at even trinomials now huh

17. NotTim

maybe s is given elsewhere in your textbook

18. helpmexoxo

no it isn't :o

19. helpmexoxo

20. NotTim

@lgbasallote wat is s?

21. lgbasallote

i'd like to say it's the distance traveled

22. helpmexoxo

23. NotTim

24. helpmexoxo

no @lgbasallote is the answe 7.2s ?!

25. helpmexoxo

i'm doing an online course not from a textbook!

26. lgbasallote

lol shouldnt @NotTim be answering this o.O wait..ill check

27. NotTim

i dont wanna do math...

28. lgbasallote

it;s what my calculator said

29. helpmexoxo

ok thank you all :)